The most important energy-transferring compound in cells is a nucleotide known as
A) deoxyribonucleic acid.
B) protein.
C) glucose.
D) adenosine triphosphate.
E) fructose.
D) adenosine triphosphate.
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Insects rely on the terpenoid __________ to control reproductive development, metamorphosis, and molting
A) Bombyxin B) Eclosion hormone C) Juvenile hormone D) Methyl farnesoate Fill in the blank with the correct answer.
Genes that are passed from male to male are called ________.
A. structural genes B. autosomes C. genotypes D. y-linked E. polygenic
Sinoatrial node cells:
A. reach threshold only when action potentials generated by the AV node arrive through gap junctions. B. exhibit spontaneous depolarization that is speeded by activation of their cholinergic receptors. C. exhibit spontaneous depolarization that is speeded by activation of their beta-adrenergic receptors. D. exhibit a steep upstroke due to the presence of the same type of Na+ channels found in neuronal membranes. E. are in-between atrial muscle cells and cells of the bundle of His.
An enzyme's specificity for its substrate is due to
A. the presence of cofactors or coenzymes. B. the shape of its active site. C. its denaturation.